XenForo developer

Controls the source of the jQuery core JavaScript library. You may host this yourself (Local) or use one of the recommended CDN sources. Google and Microsoft both support HTTPS/SSL, but the jQuery CDN does not.

XenForo developer

Once jQuery's documentation is updated to reflect that their CDN is officially supported over HTTPS, I'm sure Mike will change it.

As it stands, until quite recently there was no HTTPS support at all, and currently there's no official documentation to say they support it at all. So it could be experimental, subject to change or other issues.

So, until then, either use Google (I'd recommend this anyway) or my template edit above (at your own risk) if you wish to try the jQuery one.

With or without official support, I don't see any benefit to using the jQuery CDN over Google.